Ultra-flattened broadband dispersion compensating photonic crystal fiber with ultra-low confinement loss

A simple index-guiding circular-lattice photonic crystal fiber is presented in this paper for compensation of dispersion with extremely low confinement loss. Full vector finite element method (FEM) with an anisotropic perfectly matched absorbing layer boundary condition is used to investigate the guiding properties. The designed dispersion compensating photonic crystal fiber (DC-DCF) shows that it is possible to obtain an ultra-flattened average dispersion of −124.0 ps/(nm.km) with a dispersion variation of ± 0.1252 ps/(nm.km) in the wavelength range of 1350 to 1700 nm (around E+S+C+L+U telecommunication band) at very low confinement loss less than 10−6 dB/km by using a modest number of design parameters and very simple cladding design. Furthermore, fiber nonlinearities and single-mode operation are also checked for the entire band.